Reamer



' Jan. 2, 1934. DAV|$ 1,941,790

REAMER Filed May 21, 1930 T xw Patented Jan. 2, 1934 a 1 "um-T D STATES PATENT OFFICE Application my 21, 1930. Serial No. 454,281

2 Claims. (01. 77-72 This invention relates to reamers particularly of the cutter block for the reception of the heads adapted for usein finishing holes inmetal. It of the screws 6 so that they do not extend behas for its principal objects to produce a reamer yond the outer faces of said blocks The botwhich will accurately and smoothly :finish the toms of the cutter block receiving channels 3 'are 5 walls of such holes, to provide for the ready adinclined outwardly from their rear to their forjustment,remova1 and replacement of the blades ward ends; and, likewise, the inner. facesof the of the reamer, and to provide for simplicity and cutter blocks 4 are inclined at an angle corre-. cheapness of construction and compactness of sponding to the angle of inclination ofthe botdesign.- The invention consists in the parts and toms of said channels, whereby said blocks are m in the combinations and arrangements of parts adapted'to be adjusted radially with respect to hereinafter described and claimed. V thecylindrical head portion of the'reamer when In the accompanying drawing, which forms they are slid lengthwise of said channels. .With part of this specification and wherein like symbols this arrangement, the cutter blocks may beadrefer to like parts wherever they occur, justed radiallyof the reamer head to compensate 15. Fig.1 is a side elevation, partly in longitudinal for wear and to fit bores of different diameters. section of a reamer embodying my invention, The cutter blocks 4 are slid longitudinally of Fig. 2 is atransverse cross-section on the line the channels 3 in the reamer head 1 by means of 2-2 of Fig.- 1, 1 an adjusting nut 8 threaded on the externally Fig. 3 is a view similar to Fig. 1 illustrating a threaded shank portion 1 of the reamer adjacent '20 modified form of reamer, to the inner ends of said block. A lock nut 9 is Q Fig. 4 is a transverse section on the line 4-4 also threaded on the shank 1 of the reamer for of Fig. 3, locking the adjusting nut 8 in the desired ad- Fig. 5 is a side elevation of another modified justed position. The nuts 8 and 9 are provided construction of reamer; and with sockets 10 and 11, respectively, whereby they Fig. 6 is a transverse cross-section on the line may be manipulated by means of a spanner or pin 8 66 of Fig. 5. wrench. The adjusting nut 8 is provided oppo- The reamer shown in Figs. 1 and 2 of the acsite the inner ends of the cutter blocks 4 with a companying drawing comprises an externally circular recess having a conical band or surface threaded shank member 1 provided at its outer 12, which slopes downwardly and outwardly and or forward end with a cylindrical head portion 2. is adapted to bear or abut against similar conical 5; The exterior surface of the cylindrical head porsurfaces 13 formed on the adjacent inner ends of tion 2 of the reamer is provided with diametrisaid cutter blocks. By this arrangement, rotacally opposed longitudinal channels 3, within tion of the adjusting nut 8 in the proper direction which are seated rectangular cutter blocks 4 causes the conical surface 12 of the recess in said whose exterior surfaces are convexly curved from nut to simultaneously engage the conical inner side to side in arcs described about the rotary ends 13 of all of the blocks and thus move them axis of the reamer as a center. The convexly longitudinally of the channels3 towards the outer curved exterior surfaces of the blocks are proends thereof. During this longitudinal movement vided with a series of ribs 5, which form the cutof the cutter blocks, they will be moved radially 4D ting teeth or blades of the reamer. A shown outward by reason of the inclined bottoms of the 5 in the drawing, the blades 5 are disposed at an channels and the corresponding inclination of the oblique angle to the longitudinal axis of the reaminner surfaces of the blocks, thereby permitting er so as to cut with a shearing action and theresaid blocks to be adjusted to effect a cut of the by produce a very smooth finish on the wall of diameter desired. When the cutter blocks have the opening. The teeth or blades 5 of the sevbeen properly adjusted, the adjusting nut 8 is 100 eral cutter blocks may be arranged at the same locked against rotation by means of the lock nut angle, or alternate blocks may be provided with 9; and the cutter blocks are then clamped in the teeth disposed at a reverse angle. channels against movement therein by tightening The cutter blocks 4 are held against movement the lock screws 6.

in the channels 3 preferably by means of screws In the modified construction shown in Figs. 3 H15 6 which extend through longitudinal slots 7 proand 4, the cutter blocks are locked in the chanvided therefor in said blocks and are threaded nels or slideways provided therefor in the reamer into radial holes provided therefor in the bothead by an arrangement which dispenses with toms of said channels. As shown in the drawthe lock screws 6 and slots '7. In this construcing, the slots 7 are enlarged at the outer face tion an adjusting nut 8a is threaded onathreaded l l.0

stud 14 on the outer end of the cutter head and is provided with an annular groove having a conical surface 12a adapted to cooperate with conical surfaces 13a on the forward ends of the cutter blocks. With this arrangement, the cutter blocks are adjusted by the nuts 8 and 8a, which also serve to lock said blocks in the channels.

In the modified construction shown in Figs. 5 and 6, the forward end of the reamer is provided with a cylindrical stud 15 upon which are sleeved a series of cutter blocks in the form of rings 16, whose peripheral surfaces are provided with a series of channels or grooves 17 having blades 01' teeth 5a pressed therein that are made of a high grade cutting alloy, such as high speed steel or cemented tungsten carbide. The grooves 17 are disposed at an oblique angle to the reamer axis whereby the blades are adapted to cut with a shearing action so as to produce a very smooth finish and, at the same time, prolong the life of their cutting edges. The blades of each ring are staggered with relation to the blades of the ring? adjacent thereto and are made long enough so that the end portions of the blades of one ring overlap the end portions of the blades of an adjacent ring. The end faces of the rings are provided with notches 18 adapted to accommodate the projecting ends of the blades of adjacent rings. The rings are removably held on the stud 15, between a shoulder 19 at the inner end thereof and a nut 20, which is threaded on the outer end of the stud. V

The hereinbefore described reamer has numerous advantages. It provides an increased number of cutting edges, thereby prolonging the life of the tool and at the same time securing a high degree of accuracy; it also secures a very smooth finish, due to the shearing cut provided by the obliquely disposed blades; it permits the blades to be easily and accurately adjusted, removed and replaced; and it permits the angle of obliquity of the reamer blades to be readily changed by means of sets of cutter blocks having blades disposed at different angles.

Obviously, changes may be made without departing from the invention and I do not wish to be limited to the precise construction shown.

What I claim is:

1. A reamer comprising a body portion, a plurality of axially alined annular cutter blocks fixed thereto in abutting relation and having grooves in their peripheral surfaces that extend from end to end of said blocks and are disposed at an oblique angle to the longitudinal reamer axis, and blades mounted in the grooves in said blocks and. projecting beyond the respective blocks at the abutting ends thereof, the corresponding ends of the blades of adjacent cutter blocks being spaced apart peripherally of said reamer and overlapping longitudinally thereof.

2. A reamer comprising a body portion, aseries of axially alined annular cutter blocks fixed there to in abutting relation and having straight grooves in their peripheral surfaces disposed at the same oblique angle to the longitudinal reamer axis, and blades of high grade cutting alloy mounted in the grooves in said blocks and projecting beyond the respective blocks at the abutting ends thereof, the corresponding ends of the blades of adjacent blocks being spaced apart peripherally of said reamer and overlapping longitudinally thereof, said cutter blocks being provided between the blades thereon with notches for accommodating the projecting ends of the blades of adjacent cutter blocks.

EMERY E. DAVIS. 

